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add support for Ed25519 signature scheme with custom (Keccak512) hash…
… function this is required for NEM support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright 2024 Coinbase, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package keys | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
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| "golang.org/x/crypto/sha3" | ||
|
|
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| "github.com/coinbase/rosetta-sdk-go/asserter" | ||
| "github.com/coinbase/rosetta-sdk-go/types" | ||
|
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| nemcrypto "github.com/NemProject/nem/gocrypto" | ||
| ) | ||
|
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| // SignerEdwards25519Keccak is initialized from a keypair | ||
| type SignerEdwards25519Keccak struct { | ||
| KeyPair *KeyPair | ||
| } | ||
|
|
||
| var _ Signer = (*SignerEdwards25519Keccak)(nil) | ||
|
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| // PublicKey returns the PublicKey of the signer | ||
| func (s *SignerEdwards25519Keccak) PublicKey() *types.PublicKey { | ||
| return s.KeyPair.PublicKey | ||
| } | ||
|
|
||
| // Sign arbitrary payloads using a KeyPair | ||
| func (s *SignerEdwards25519Keccak) Sign( | ||
| payload *types.SigningPayload, | ||
| sigType types.SignatureType, | ||
| ) (*types.Signature, error) { | ||
| err := s.KeyPair.IsValid() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("key pair is invalid: %w", err) | ||
| } | ||
|
|
||
| if !(payload.SignatureType == types.Ed25519_Keccak || payload.SignatureType == "") { | ||
| return nil, fmt.Errorf( | ||
| "expected signing payload signature type %v but got %v: %w", | ||
| types.Ed25519_Keccak, | ||
| payload.SignatureType, | ||
| ErrSignUnsupportedPayloadSignatureType, | ||
| ) | ||
| } | ||
|
|
||
| if sigType != types.Ed25519_Keccak { | ||
| return nil, fmt.Errorf( | ||
| "expected signature type %v but got %v: %w", | ||
| types.Ed25519_Keccak, | ||
| sigType, | ||
| ErrSignUnsupportedSignatureType, | ||
| ) | ||
| } | ||
|
|
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| hasher := sha3.NewLegacyKeccak512() | ||
| privKeyBytes := s.KeyPair.PrivateKey | ||
| privKey := nemcrypto.NewKeyFromSeed(privKeyBytes, hasher) | ||
| sig := nemcrypto.Sign(privKey, payload.Bytes, hasher) | ||
|
|
||
| return &types.Signature{ | ||
| SigningPayload: payload, | ||
| PublicKey: s.KeyPair.PublicKey, | ||
| SignatureType: payload.SignatureType, | ||
| Bytes: sig, | ||
| }, nil | ||
| } | ||
|
|
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| // Verify verifies a Signature, by checking the validity of a Signature, | ||
| // the SigningPayload, and the PublicKey of the Signature. | ||
| func (s *SignerEdwards25519Keccak) Verify(signature *types.Signature) error { | ||
| if signature.SignatureType != types.Ed25519_Keccak { | ||
| return fmt.Errorf( | ||
| "expected signing payload signature type %v but got %v: %w", | ||
| types.Ed25519_Keccak, | ||
| signature.SignatureType, | ||
| ErrVerifyUnsupportedPayloadSignatureType, | ||
| ) | ||
| } | ||
|
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| pubKey := signature.PublicKey.Bytes | ||
| message := signature.SigningPayload.Bytes | ||
| sig := signature.Bytes | ||
| err := asserter.Signatures([]*types.Signature{signature}) | ||
| if err != nil { | ||
| return fmt.Errorf("signature is invalid: %w", err) | ||
| } | ||
|
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| hasher := sha3.NewLegacyKeccak512() | ||
| verify := nemcrypto.Verify(pubKey, message, sig, hasher) | ||
| if !verify { | ||
| return ErrVerifyFailed | ||
| } | ||
|
|
||
| return nil | ||
| } |
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